A post at reddit asked a hypothetical question: could a modern US Marine infantry battalion defeat the legionnaires of the Roman Empire if they traveled back in time? Member Prufrock451 offered a scenario covering a week of such a story in a series of well-received comments. Here's a sample:

DAY 1 The 35th MEU is on the ground at Kabul, preparing to deploy to southern Afghanistan. Suddenly, it vanishes.

The section of Bagram where the 35th was gathered suddenly reappears in a field outside Rome, on the west bank of the Tiber River. Without substantially prepared ground under it, the concrete begins sinking into the marshy ground and cracking. Colonel Miles Nelson orders his men to regroup near the vehicle depot - nearly all of the MEU's vehicles are still stripped for air transport. He orders all helicopters airborne, believing the MEU is trapped in an earthquake.

Nelson's men soon report a complete loss of all communications, including GPS and satellite radio. Nelson now believes something more terrible has occurred - a nuclear war and EMP which has left his unit completely isolated. Only a few men have realized that the rest of Bagram has vanished, but that will soon become apparent as the transport helos begin circling the 35th's location.

Within an hour, the 2,200 Marines have regrouped, stunned. They are not the only moderns transported to Rome. With them are about 150 Air Force maintenance and repair specialists. There are about 60 Afghan Army soldiers, mostly the MEU's interpreters and liaisons. There are also 15 U.S. civilian contractors and one man, Frank Delacroix, who has spoken to no one but Colonel Nelson.

OK, here's where it gets interesting. Adam Kolbrenner from Madhouse Entertainment read the story on reddit and contacted the author, James Erwin, about developing the idea. Warner Brothers bought the story, now called Rome, Sweet Rome, and is making plans to film it. Link -via reddit

That's why I think that Forstchen hit the technological sweet spot in The Lost Regiment by putting a Civil War era infantry regiment in medieval Russia. The soldiers had the know-how to make a smoothbore musket and cannons, and the Russians had the tools necessary to make the tools necessary to manufacture them.